* {
    margin: 0;
    padding: 0;
}

body,
html {
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    background: #aaa;
    display: flex;
    justify-content: center;
    align-items: center;

    canvas {
        background: #aaa;
        display: block;
    }
}